Geoffrey Lumsden was a British character actor

Actor

An actor is a person who acts in a dramatic production and who works in film, television, theatre, or radio in that capacity...

 who had a lengthy career on television.

By some way his best known role was Captain Square in Dad's Army

Dad's Army

Dad's Army is a British sitcom about the Home Guard during the Second World War. It was written by Jimmy Perry and David Croft and broadcast on BBC television between 1968 and 1977. The series ran for 9 series and 80 episodes in total, plus a radio series, a feature film and a stage show...

, the pompous commander of the Eastgate platoon of the Home Guard who was a rival of Captain Mainwaring.

He appeared in a few episodes, though mentioned in some, but uncredited -

• Series 1 episode 3 "Command Decision" 1968,
  Series 2 episode 11 "A Stripe for Frazer" 1969 (lost),
  Series 2 episode 12 "Under Fire" 1969 (lost),
  Series 4 episode 28 "Don’t Forget the Diver" 1970,
  Series 4 episode 37 "A. Wilson (Manager)" 1970, (Mentioned)
  First Xmas Special episode 39 "Fallen Idol" 1970,
  Second Xmas special, episode 40 "Battle of the Giants" 1971,
  Series 5 episode 50 "Brain Versus Brawn" 1972, (Cameo),
  *Series 5 episode 51 "A Brush with the Law" 1972,
  Series 5 episode 52 "Round and Round went the Great Big Wheel" 1972, (Cameo),
  *Series 6 episode 55 "My British Buddy" 1973,
  *Series 6 episode 56 "The Royal Train" 1973
  *Series 7 episode 64 "The Godiva Affair" 1974 (Cameo),
  Third Xmas special, episode 66 "Turkey Dinner" 1974 (Cameo),
  Series 8 episode 68 "When You've Got to Go" (Cameo),
  Series 8 episode 71 "High Finance" 1975 (Cameo),
  Fifth Xmas special "The Love of Three Oranges" (Cameo),
  Series 9 episode 75 "Wake Up Walmington" 1977 and
  Series 9 episode 77 "Knights of Madness" 1977 (Cameo).
• Upstairs, Downstairs
  Upstairs, Downstairs
  Upstairs, Downstairs is a British drama television series originally produced by London Weekend Television and revived by the BBC. It ran on ITV in 68 episodes divided into five series from 1971 to 1975, and a sixth series shown on the BBC on three consecutive nights, 26–28 December 2010.Set in a...
  
  (Word of Honour) 1973: Sir William Trevanion

Selected filmography

• Dateline Diamonds
  Dateline Diamonds
  Dateline Diamonds is a 1966 British music-film. The film was shot in black and white. The "pop and cop" genre of film was a popular concept in the UK during the early 1960s to highlight young music talent and was geared to appeal directly to the young teenage market...
  
  (1965)
• The Night Caller (1965)
• A Dandy in Aspic
  A Dandy in Aspic
  A Dandy in Aspic is a 1968 British spy film, directed by Anthony Mann, based on the novel of the same name by Derek Marlowe and starring Laurence Harvey, Tom Courtenay and Mia Farrow....
  
  (1968)
• Salt and Pepper (1968)
• Hostile Witness
  Hostile Witness
  For the legal term, please see Hostile witnessHostile Witness is a 1968 British courtroom-based drama film based on a play by Jack Roffey, directed by Ray Milland and starring Milland, Sylvia Sims, Raymond Huntley and Julian Holloway.-Cast:* Ray Milland as Simon Crawford - Q.C.* Sylvia Syms as...
  
  (1968)
• Rookery Nook
  Rookery Nook (1970 film)
  Rookery Nook is a 1970 British comedy television film starring Richard Briers, Arthur Lowe and Irene Handl. It is based on the play Rookery Nook, one of the Aldwych Farces, by Ben Travers. It was first aired on the BBC on 19 September 1970.-Cast:...
  
  (1970, TV film)
• The Horror of Frankenstein
  The Horror of Frankenstein
  The Horror of Frankenstein is a 1970 British horror film by Hammer Film Productions that is both a semi-parody and remake of the 1957 film The Curse of Frankenstein. It was produced and directed by Jimmy Sangster, starring Ralph Bates, Kate O'Mara, Veronica Carlson and David Prowse as the monster...
  
  (1970)

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